<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			//alert(histort.length);
			//histort.foward();
			setTimeout(function(){
				histort.back();
				//histort.go(-1);
			},3000);
			
		</script>
	</head>
	<body>
		<h1>这里是4.HTML页面</h1>
		<a href="1.html">点我跳转到1.HTML界面</a>;
	</body>
</html>
